(57) A PTC heater having a heat conductor, a first end cover, a second end cover, and
a PTC heating element. The heat conductor includes a duct for accommodating a PTC
heating element, a first liquid passage channel, and a second liquid passage channel.
The
first end cover is coupled to one end of the heat conductor and includes a first and
a second compartment, a water inlet, and a water outlet. The water inlet is in fluid
communication with the first compartment and the first liquid passage channel, and
the water outlet is in fluid communication with the second compartment and the second
liquid passage channel. The second end cover is coupled to the other end of the heat
conductor. The first and second
10 liquid passage channels are in fluid communication with each other via an internal
space of the second end cover to form a closed liquid circulation channel. The second
end cover comprises at least one groove capable of accommodating the portion of the
PTC heating element extending out of the duct, the groove is also in communication
with the external space.
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